What is International Standard Atmosphere?
International Standard Atmosphere A model of the atmosphere based on standard average conditions at sea level, used for calibrating instruments and performance calculations. Defined by ICAO: 15°C, 1013.25 hPa, and lapse rate of 2°C per 1000 ft.
Source: ICAO Doc 9432, FAA PCG
How is “International Standard Atmosphere” Used in Practice?
Performance charts are based on International Standard Atmosphere conditions unless otherwise noted.
Certification Exam Relevance
Who Needs to Know This Term?
- Pilots
- Air Traffic Controllers
- Cabin Crew
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What is International Standard Atmosphere?
A model of the atmosphere based on standard average conditions at sea level, used for calibrating instruments and performance calculations. Defined by ICAO: 15°C, 1013.25 hPa, and lapse rate of 2°C per 1000 ft.
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